Ubuntu 13.04: USN-1990-1 Moderate: X.Org X Server Input Issue

ubuntu

October 17, 2013

The X.Org X server could be made to crash or run programs as an administrator if it received specially crafted input.

Summary

The X.Org X server could be made to crash or run programs as an

administrator if it received specially crafted input.

Software Description:

- xorg-server: X.Org X11 server

- xorg-server-lts-quantal: X.Org X11 server

- xorg-server-lts-raring: X.Org X11 server

Details:

Pedro Ribeiro discovered that the X.Org X server incorrectly handled

memory operations when handling ImageText requests. An attacker could use

this issue to cause X.Org to crash, or to possibly execute arbitrary code.

(CVE-2013-4396)

It was discovered that non-root X.Org X servers such as Xephyr incorrectly

used cached xkb files. A local attacker could use this flaw to cause a xkb

cache file to be loaded by another user, resulting in a denial of service.

(CVE-2013-1056)

Topics Covered

security advisory moderate update DoS Ubuntu xorg-server input flaw

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 13.04:
  xserver-xorg-core               2:1.13.3-0ubuntu6.2

Ubuntu 12.10:
  xserver-xorg-core               2:1.13.0-0ubuntu6.4

Ubuntu 12.04 LTS:
  xserver-xorg-core               2:1.11.4-0ubuntu10.14
  xserver-xorg-core-lts-quantal   2:1.13.0-0ubuntu6.1~precise4
  xserver-xorg-core-lts-raring    2:1.13.3-0ubuntu6~precise3

After a standard system update you need to reboot your computer to make
all the necessary changes.